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783 results on '"Zhang, Guobin"'

6. Effects of silicon on water metabolism and photosynthetic characteristics of Cucurbita pepo L. seedlings under salt stress

Author

WANG Guoshuai, ZHAO Jianuo, WEI Haotai, WANG Peng, LUO Shilei, and ZHANG Guobin

Subjects
cucurbita pepo l., silicon, salt stress, water metabolism, photosynthetic characteristics, Biology (General), QH301-705.5, Botany, QK1-989
Abstract

[ Objective ] This study aims to explore the protective mechanism of exogenous silicon on water metabolism and photosynthesis of Cucurbita pepo L. seedlings under salt stress , and to provide theoretical reference for salt resistance of C . pepo L.. [ Methods ] Using “ Hanlu 7042 ” C . pepo L. variety as the test material and hydroponic experiment , four treatments were set : Control , silicon treatment ( 0.3 mmol / L Na 2 SiO 3 · 9H 2 O ), salt stress ( 150 mmol / L NaCl ), salt stress+silicon treatment ( 0.3 mmol / L Na 2 SiO 3 · 9H 2 O+150 mmol / L NaCl ) . After 10 days of treatment , root morphology and activity , leaf water con- tent and water potential , photosynthetic parameters , chlorophyll content , chlorophyll fluorescence param- eters , and expression of aquaporin genes were determined. [ Results ] Salt stress inhibited the growth of C . pepo L. seedling roots , and decreased root activity , leaf water content , and leaf water potential and tran- spiration. Salt stress also affected the photosynthetic system , net photosynthetic rate , stomatal conduct- ance , chlorophyll content , and PSⅡ photochemical efficiency. Exogenous silicon improved the root mor- phology and activity of C . pepo L. seedlings under salt stress , also improved plant water status , and leaf water content , leaf water potential , and transpiration by promoting the expression of genes PIP1 ; 2 , PIP1 ; 3 , PIP1 ; 5 , PIP1 ; 7 , PIP2 ; 1 , PIP2 ; 4 , PIP2 ; 6 , and PIP2 ; 8 , PIP2 ; 9 and PIP2 ; 12 . The exogenous silicon also increased the stomatal conductance , chlorophyll content , net photosynthetic rate , PSⅡ maximum photochemical efficiency , PSⅡ actual photochemical efficiency , and photochemical quenching coefficient , decreased intercellular carbon dioxide concentration and non-photochemical quench- ing coefficient , enhanced the photosynthesis of seedlings under salt stress. [ Conclusion ] 0.3 mmol / L sili- con could improve the water metabolism and photosynthesis of C . pepo L. seedlings under salt stress , and thus enhance the ability of C . pepo L. seedlings to resist salt stress.

Published
2024
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19. Exhaustive drainage versus fixed-time drainage for chronic subdural hematoma after one-burr hole craniostomy (ECHO): study protocol for a multicenter randomized controlled trial

Author

Wu, Liang, Ou, Yunwei, Zhu, Bingcheng, Guo, Xufei, Yu, Xiaofan, Xu, Long, Li, Jinping, Feng, Enshan, Li, Huaqing, Wang, Xiaodong, Chen, Huaqun, Sun, Zhaosheng, Liu, Zaofu, Yang, Dawei, Zhang, Hongbing, Liu, Zhigang, Tang, Jie, Zhao, Shangfeng, Zhang, Guobin, Yao, Jiemin, Ma, Dongming, Sun, Zelin, Zhou, Hui, Liu, Baiyun, and Liu, Weiming

Published
2023
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37. Three-dimensional simulation of a new cooling strategy for proton exchange membrane fuel cell stack using a non-isothermal multiphase model

Author

Zhang, Guobin, Yuan, Hao, Wang, Yun, and Jiao, Kui

Subjects
PEM fuel cell, Stack, 3D, Multiphase, New cooling strategy, Engineering, Economics, Energy
Abstract

In this study, a new cooling strategy for a proton exchange membrane (PEM) fuel cell stack is investigated using a three-dimensional (3D) multiphase non-isothermal model. The new cooling strategy follows that of the Honda's Clarity design and further extends to a cooling unit every five cells in stacks. The stack consists of 5 fuel cells sharing the inlet and outlet manifolds for reactant gas flows. Each cell has 7-path serpentine flow fields with a counter-flow configuration arranged for hydrogen and air streams. The coolant flow fields are set at the two sides of the stack and are simplified as the convective heat transfer thermal boundary conditions. This study also compares two thermal boundary conditions, namely limited and infinite coolant flow rates, and their impacts on the distributions of oxygen, liquid water, current density and membrane hydration. The difference of local temperature between these two cooling conditions is as much as 6.9 K in the 5-cell stack, while it is only 1.7 K in a single cell. In addition, the increased vapor concentration at high temperature (and hence water saturation pressure) dilutes the oxygen content in the air flow, reducing local oxygen concentration. The higher temperature in the stack also causes low membrane hydration, and consequently poor cell performance and non-uniform current density distribution, as disclosed by the simulation. The work indicates the new cooling strategy can be optimized by increasing the heat transfer coefficient between the stack and coolant to mitigate local overheating and cell performance reduction.

Published
2019

38. Effects of intensive blood pressure lowering on cerebral ischaemia in thrombolysed patients: insights from the ENCHANTED trial

Author

Chen, Chen, Ouyang, Menglu, Ong, Sheila, Zhang, Luyun, Zhang, Guobin, Delcourt, Candice, Mair, Grant, Liu, Leibo, Billot, Laurent, Li, Qiang, Chen, Xiaoying, Parsons, Mark, Broderick, Joseph P., Demchuk, Andrew M., Bath, Philip M., Donnan, Geoffrey A., Levi, Christopher, Chalmers, John, Lindley, Richard I., Martins, Sheila O., Pontes-Neto, Octavio M., Venturelli, Paula Muñoz, Olavarría, Verónica, Lavados, Pablo, Robinson, Thompson G., Wardlaw, Joanna M., Li, Gang, Wang, Xia, Song, Lili, and Anderson, Craig S.

Published
2023
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